CVE-2022-49892

Estado: ModificadaAlta (7.8)—

In the Linux kernel, the following vulnerability has been resolved:

ftrace: Fix use-after-free for dynamic ftrace_ops

KASAN reported a use-after-free with ftrace ops [1]. It was found from vmcore that perf had registered two ops with the same content successively, both dynamic. After unregistering the second ops, a use-after-free occurred.

In ftrace_shutdown(), when the second ops is unregistered, the FTRACE_UPDATE_CALLS command is not set because there is another enabled ops with the same content. Also, both ops are dynamic and the ftrace callback function is ftrace_ops_list_func, so the FTRACE_UPDATE_TRACE_FUNC command will not be set. Eventually the value of 'command' will be 0 and ftrace_shutdown() will skip the rcu synchronization.

Leer descripción completaMostrar menos

However, ftrace may be activated. When the ops is released, another CPU may be accessing the ops. Add the missing synchronization to fix this problem.

Detalles técnicos trazas, registros y código del informe original

[1]
BUG: KASAN: use-after-free in __ftrace_ops_list_func kernel/trace/ftrace.c:7020 [inline]
BUG: KASAN: use-after-free in ftrace_ops_list_func+0x2b0/0x31c kernel/trace/ftrace.c:7049
Read of size 8 at addr ffff56551965bbc8 by task syz-executor.2/14468

CPU: 1 PID: 14468 Comm: syz-executor.2 Not tainted 5.10.0 #7
Hardware name: linux,dummy-virt (DT)
Call trace:
 dump_backtrace+0x0/0x40c arch/arm64/kernel/stacktrace.c:132
 show_stack+0x30/0x40 arch/arm64/kernel/stacktrace.c:196
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1b4/0x248 lib/dump_stack.c:118
 print_address_description.constprop.0+0x28/0x48c mm/kasan/report.c:387
 __kasan_report mm/kasan/report.c:547 [inline]
 kasan_report+0x118/0x210 mm/kasan/report.c:564
 check_memory_region_inline mm/kasan/generic.c:187 [inline]
 __asan_load8+0x98/0xc0 mm/kasan/generic.c:253
 __ftrace_ops_list_func kernel/trace/ftrace.c:7020 [inline]
 ftrace_ops_list_func+0x2b0/0x31c kernel/trace/ftrace.c:7049
 ftrace_graph_call+0x0/0x4
 __might_sleep+0x8/0x100 include/linux/perf_event.h:1170
 __might_fault mm/memory.c:5183 [inline]
 __might_fault+0x58/0x70 mm/memory.c:5171
 do_strncpy_from_user lib/strncpy_from_user.c:41 [inline]
 strncpy_from_user+0x1f4/0x4b0 lib/strncpy_from_user.c:139
 getname_flags+0xb0/0x31c fs/namei.c:149
 getname+0x2c/0x40 fs/namei.c:209
 [...]

Allocated by task 14445:
 kasan_save_stack+0x24/0x50 mm/kasan/common.c:48
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc mm/kasan/common.c:479 [inline]
 __kasan_kmalloc.constprop.0+0x110/0x13c mm/kasan/common.c:449
 kasan_kmalloc+0xc/0x14 mm/kasan/common.c:493
 kmem_cache_alloc_trace+0x440/0x924 mm/slub.c:2950
 kmalloc include/linux/slab.h:563 [inline]
 kzalloc include/linux/slab.h:675 [inline]
 perf_event_alloc.part.0+0xb4/0x1350 kernel/events/core.c:11230
 perf_event_alloc kernel/events/core.c:11733 [inline]
 __do_sys_perf_event_open kernel/events/core.c:11831 [inline]
 __se_sys_perf_event_open+0x550/0x15f4 kernel/events/core.c:11723
 __arm64_sys_perf_event_open+0x6c/0x80 kernel/events/core.c:11723
 [...]

Freed by task 14445:
 kasan_save_stack+0x24/0x50 mm/kasan/common.c:48
 kasan_set_track+0x24/0x34 mm/kasan/common.c:56
 kasan_set_free_info+0x20/0x40 mm/kasan/generic.c:358
 __kasan_slab_free.part.0+0x11c/0x1b0 mm/kasan/common.c:437
 __kasan_slab_free mm/kasan/common.c:445 [inline]
 kasan_slab_free+0x2c/0x40 mm/kasan/common.c:446
 slab_free_hook mm/slub.c:1569 [inline]
 slab_free_freelist_hook mm/slub.c:1608 [inline]
 slab_free mm/slub.c:3179 [inline]
 kfree+0x12c/0xc10 mm/slub.c:4176
 perf_event_alloc.part.0+0xa0c/0x1350 kernel/events/core.c:11434
 perf_event_alloc kernel/events/core.c:11733 [inline]
 __do_sys_perf_event_open kernel/events/core.c:11831 [inline]
 __se_sys_perf_event_open+0x550/0x15f4 kernel/events/core.c:11723
 [...]

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.22%
Percentil entre todas las CVEs puntuadas: 11
Fecha de la puntuación: 5/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation85 %
Impacto principalT1059 Command and Scripting Interpreterexecution75 %

Acceso local (AV:L) sin interacción del usuario permite escalar privilegios mediante use-after-free en ftrace; impacto en ejecución de código arbitrario con permisos elevados (I:H, A:H).

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Execution Prevention Threat Intelligence Program Restrict Web-Based Content Privileged Account Management Limit Software Installation Behavior Prevention on Endpoint

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-416

Referencias

JSON original (NVD)

Mostrar

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              "lessThan": "4.14",
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            {
              "status": "unaffected",
              "version": "5.10.154",
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              "lessThanOrEqual": "5.10.*"
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          "value": "CWE-416"
        }
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    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nftrace: Fix use-after-free for dynamic ftrace_ops\n\nKASAN reported a use-after-free with ftrace ops [1]. It was found from\nvmcore that perf had registered two ops with the same content\nsuccessively, both dynamic. After unregistering the second ops, a\nuse-after-free occurred.\n\nIn ftrace_shutdown(), when the second ops is unregistered, the\nFTRACE_UPDATE_CALLS command is not set because there is another enabled\nops with the same content.  Also, both ops are dynamic and the ftrace\ncallback function is ftrace_ops_list_func, so the\nFTRACE_UPDATE_TRACE_FUNC command will not be set. Eventually the value\nof 'command' will be 0 and ftrace_shutdown() will skip the rcu\nsynchronization.\n\nHowever, ftrace may be activated. When the ops is released, another CPU\nmay be accessing the ops.  Add the missing synchronization to fix this\nproblem.\n\n[1]\nBUG: KASAN: use-after-free in __ftrace_ops_list_func kernel/trace/ftrace.c:7020 [inline]\nBUG: KASAN: use-after-free in ftrace_ops_list_func+0x2b0/0x31c kernel/trace/ftrace.c:7049\nRead of size 8 at addr ffff56551965bbc8 by task syz-executor.2/14468\n\nCPU: 1 PID: 14468 Comm: syz-executor.2 Not tainted 5.10.0 #7\nHardware name: linux,dummy-virt (DT)\nCall trace:\n dump_backtrace+0x0/0x40c arch/arm64/kernel/stacktrace.c:132\n show_stack+0x30/0x40 arch/arm64/kernel/stacktrace.c:196\n __dump_stack lib/dump_stack.c:77 [inline]\n dump_stack+0x1b4/0x248 lib/dump_stack.c:118\n print_address_description.constprop.0+0x28/0x48c mm/kasan/report.c:387\n __kasan_report mm/kasan/report.c:547 [inline]\n kasan_report+0x118/0x210 mm/kasan/report.c:564\n check_memory_region_inline mm/kasan/generic.c:187 [inline]\n __asan_load8+0x98/0xc0 mm/kasan/generic.c:253\n __ftrace_ops_list_func kernel/trace/ftrace.c:7020 [inline]\n ftrace_ops_list_func+0x2b0/0x31c kernel/trace/ftrace.c:7049\n ftrace_graph_call+0x0/0x4\n __might_sleep+0x8/0x100 include/linux/perf_event.h:1170\n __might_fault mm/memory.c:5183 [inline]\n __might_fault+0x58/0x70 mm/memory.c:5171\n do_strncpy_from_user lib/strncpy_from_user.c:41 [inline]\n strncpy_from_user+0x1f4/0x4b0 lib/strncpy_from_user.c:139\n getname_flags+0xb0/0x31c fs/namei.c:149\n getname+0x2c/0x40 fs/namei.c:209\n [...]\n\nAllocated by task 14445:\n kasan_save_stack+0x24/0x50 mm/kasan/common.c:48\n kasan_set_track mm/kasan/common.c:56 [inline]\n __kasan_kmalloc mm/kasan/common.c:479 [inline]\n __kasan_kmalloc.constprop.0+0x110/0x13c mm/kasan/common.c:449\n kasan_kmalloc+0xc/0x14 mm/kasan/common.c:493\n kmem_cache_alloc_trace+0x440/0x924 mm/slub.c:2950\n kmalloc include/linux/slab.h:563 [inline]\n kzalloc include/linux/slab.h:675 [inline]\n perf_event_alloc.part.0+0xb4/0x1350 kernel/events/core.c:11230\n perf_event_alloc kernel/events/core.c:11733 [inline]\n __do_sys_perf_event_open kernel/events/core.c:11831 [inline]\n __se_sys_perf_event_open+0x550/0x15f4 kernel/events/core.c:11723\n __arm64_sys_perf_event_open+0x6c/0x80 kernel/events/core.c:11723\n [...]\n\nFreed by task 14445:\n kasan_save_stack+0x24/0x50 mm/kasan/common.c:48\n kasan_set_track+0x24/0x34 mm/kasan/common.c:56\n kasan_set_free_info+0x20/0x40 mm/kasan/generic.c:358\n __kasan_slab_free.part.0+0x11c/0x1b0 mm/kasan/common.c:437\n __kasan_slab_free mm/kasan/common.c:445 [inline]\n kasan_slab_free+0x2c/0x40 mm/kasan/common.c:446\n slab_free_hook mm/slub.c:1569 [inline]\n slab_free_freelist_hook mm/slub.c:1608 [inline]\n slab_free mm/slub.c:3179 [inline]\n kfree+0x12c/0xc10 mm/slub.c:4176\n perf_event_alloc.part.0+0xa0c/0x1350 kernel/events/core.c:11434\n perf_event_alloc kernel/events/core.c:11733 [inline]\n __do_sys_perf_event_open kernel/events/core.c:11831 [inline]\n __se_sys_perf_event_open+0x550/0x15f4 kernel/events/core.c:11723\n [...]"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ftrace: Arreglo de use-after-free para ftrace_ops dinámicos KASAN informó de un use-after-free con operaciones ftrace [1]. Se encontró desde vmcore que perf había registrado dos operaciones con el mismo contenido sucesivamente, ambas dinámicas. Después de anular el registro de la segunda operación, se produjo un use-after-free. En ftrace_shutdown(), cuando se anula el registro de la segunda operación, el comando FTRACE_UPDATE_CALLS no se establece porque hay otra operación habilitada con el mismo contenido. Además, ambas operaciones son dinámicas y la función de devolución de llamada de ftrace es ftrace_ops_list_func, por lo que el comando FTRACE_UPDATE_TRACE_FUNC no se establecerá. Finalmente, el valor de 'command' será 0 y ftrace_shutdown() omitirá la sincronización de rcu. Sin embargo, ftrace puede estar activado. Cuando se libera la operación, otra CPU puede estar accediendo a ella. Agregue la sincronización faltante para solucionar este problema. [1] ERROR: KASAN: use-after-free en __ftrace_ops_list_func kernel/trace/ftrace.c:7020 [en línea] ERROR: KASAN: use-after-free en ftrace_ops_list_func+0x2b0/0x31c kernel/trace/ftrace.c:7049 Lectura de tamaño 8 en la dirección ffff56551965bbc8 por la tarea syz-executor.2/14468 CPU: 1 PID: 14468 Comm: syz-executor.2 No contaminado 5.10.0 #7 Nombre del hardware: linux,dummy-virt (DT) Rastreo de llamadas: dump_backtrace+0x0/0x40c arch/arm64/kernel/stacktrace.c:132 show_stack+0x30/0x40 arch/arm64/kernel/stacktrace.c:196 __dump_stack lib/dump_stack.c:77 [en línea] dump_stack+0x1b4/0x248 lib/dump_stack.c:118 print_address_description.constprop.0+0x28/0x48c mm/kasan/report.c:387 __kasan_report mm/kasan/report.c:547 [en línea] kasan_report+0x118/0x210 mm/kasan/report.c:564 check_memory_region_inline mm/kasan/generic.c:187 [en línea] __asan_load8+0x98/0xc0 mm/kasan/generic.c:253 __ftrace_ops_list_func kernel/trace/ftrace.c:7020 [en línea] ftrace_ops_list_func+0x2b0/0x31c kernel/trace/ftrace.c:7049 ftrace_graph_call+0x0/0x4 __might_sleep+0x8/0x100 include/linux/perf_event.h:1170 __might_fault mm/memory.c:5183 [en línea] __might_fault+0x58/0x70 mm/memory.c:5171 do_strncpy_from_user lib/strncpy_from_user.c:41 [en línea] strncpy_from_user+0x1f4/0x4b0 lib/strncpy_from_user.c:139 getname_flags+0xb0/0x31c fs/namei.c:149 getname+0x2c/0x40 fs/namei.c:209 [...] Asignado por la tarea 14445: kasan_save_stack+0x24/0x50 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [en línea] __kasan_kmalloc mm/kasan/common.c:479 [en línea] __kasan_kmalloc.constprop.0+0x110/0x13c mm/kasan/common.c:449 kasan_kmalloc+0xc/0x14 mm/kasan/common.c:493 kmem_cache_alloc_trace+0x440/0x924 mm/slub.c:2950 kmalloc include/linux/slab.h:563 [en línea] kzalloc include/linux/slab.h:675 [en línea] perf_event_alloc.part.0+0xb4/0x1350 kernel/events/core.c:11230 perf_event_alloc kernel/events/core.c:11733 [en línea] __do_sys_perf_event_open kernel/events/core.c:11831 [en línea] __se_sys_perf_event_open+0x550/0x15f4 kernel/events/core.c:11723 __arm64_sys_perf_event_open+0x6c/0x80 kernel/events/core.c:11723 [...] Liberado por la tarea 14445: kasan_save_stack+0x24/0x50 mm/kasan/common.c:48 kasan_set_track+0x24/0x34 mm/kasan/common.c:56 kasan_set_free_info+0x20/0x40 mm/kasan/generic.c:358 __kasan_slab_free.part.0+0x11c/0x1b0 mm/kasan/common.c:437 __kasan_slab_free mm/kasan/common.c:445 [en línea] kasan_slab_free+0x2c/0x40 mm/kasan/common.c:446 slab_free_hook mm/slub.c:1569 [en línea] slab_free_freelist_hook mm/slub.c:1608 [en línea] slab_free mm/slub.c:3179 [en línea] kfree+0x12c/0xc10 mm/slub.c:4176 perf_event_alloc.part.0+0xa0c/0x1350 kernel/events/core.c:11434 perf_event_alloc kernel/events/core.c:11733 [en línea] __do_sys_perf_event_open kernel/events/core.c:11831 [en línea] __se_sys_perf_event_open+0x550/0x15f4 kernel/events/core.c:11723 [...]"
    }
  ],
  "lastModified": "2026-08-04T10:17:58.323",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "91BB91F2-46E3-449B-A3FE-F98A6B3BE083",
              "versionEndExcluding": "4.2",
              "versionStartIncluding": "4.1.45"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "EBC7F61E-A805-4852-B85F-8F68C59C14F1",
              "versionEndExcluding": "4.5",
              "versionStartIncluding": "4.4.89"
            },
            {
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